Installation Failure: Windows failed to install the following update with error 0x80246007: Definition Update for Microsoft Endpoint Protection - KB2461484 (Definition 1.205.681.0).Īfter reinstalling System Center this update installs with no problems and the PC itself seems happy again. I've also noticed when I manage to forcibly close the MsMpEng process I get a failed definition update event log: Reboot then reinstall System Center client, which in turn installs the AV. The Endpoint Protection and the System Center client. I'm having to use a third party tool called RunAsTI which runs as command prompt as TrustedInstaller, from there I run Process Explorer, from the services tab of the MsMpEng process I can stop the process from running (eventually!). Any access to network resources appears extremely delayed, non responsive even. Users get stuck at the 'Welcome' logging on screen for at least 15-20 minutes. My company is also experiencing issues, I've had to fix three PCs already today.
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